i know a c/c who tried to clean poly/velv suite without proper inspection & it ended up costing him £800- just to replace the seating areas alone! he failed to notice that the backing had perished, so when he attempted to clean it the backing was highlighted. there was nothing he could do to correct it. very costly, he even paid me to have ago at it, but to no avail. all he used to clean it was solutions no2. regards freshi